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US 4,395,828 AGranted
Combination geodetic transit compass and signal mirror
AssigneeTexasgulf Inc.
InventorAllan P. Juhas
Life of this patent
Estimating the term…
Abstract
A geodetic compass having a mirrored cover that has the dual purpose of providing means for reading the compass needle orientation for geodetic purposes, while at the same time having cross hatch diffractional sighting means incorporated in said cover and mirror for utilizing said mirror for emergency signalling purposes.
Claims5
A geodetic compass and signal device comprising
- a base member housing a rotatable magnetic compass needle and including a calibrated peripheral scale;
- a cover hinged to said base member, said cover including a front sight means having a sighting aperture, a mirror in facing relation to the compass needle, an aperture extending through said mirror and said cover, and a rectangular mesh diffraction grid in said aperture for reflective alignment of said mirror with a distant target for signalling purposes;
- and
- a rear sight means hingedly connected to said base member opposite said cover, said rear sight means including a sighting means and an elongated opening therein for reading of said compass needle in said mirror for sighting purposes.
1 more element
Dependencies are inferred from the claim text.